28228208 has 10 divisors (see below), whose sum is σ = 54692184. Its totient is φ = 14114096.

The previous prime is 28228169. The next prime is 28228229. The reversal of 28228208 is 80282282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 882116 + ... + 882147.

Almost surely, 2^28228208 is an apocalyptic number.

It is an amenable number.

28228208 is a deficient number, since it is larger than the sum of its proper divisors (26463976).

28228208 is a wasteful number, since it uses less digits than its factorization.

28228208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764271 (or 1764265 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The square root of 28228208 is about 5313.0224919531. The cubic root of 28228208 is about 304.4816349607.

It can be divided in two parts, 2822820 and 8, that multiplied together give a triangular number (22582560 = T₆₇₂₀).

The spelling of 28228208 in words is "twenty-eight million, two hundred twenty-eight thousand, two hundred eight".